<template>
  <div class="bottom-menu">
    <check-button class="select-all"  :is-checked='isSelectAll' @click.native="checkAll"></check-button>
    <span>全选</span>
    <span class="total-price">合计: ¥{{totalPrice}}</span>
    <span class="buy-product" @click="calcClick">去计算({{$store.getters.cartlength}})</span>
  </div>
</template>

<script>
 import CheckButton from './CheckButton'

  export default {
    name: "CarBottomBar",
    components: {
		  CheckButton
    },
    computed: {
		  totalPrice() {
        return this.$store.state.cartList.filter(item => {
          return item.checked
        }).reduce((preValue,item) => {
          return preValue + item.price * item.count 
        },0).toFixed(2)
      },
      isSelectAll() {
        if(this.$store.getters.cartlength == 0) {
          return false
        }else{
          return !this.$store.getters.cartList.find(item => !item.checked)
        }
        
      }
    },
    methods: {
       checkAll() {
         if(this.isSelectAll){ //全选
           this.$store.getters.cartList.forEach(element => element.checked = false )
         } else {
           this.$store.getters.cartList.forEach(element => element.checked = true )
         }
       },
       calcClick() {
         if(!this.isSelectAll) {
           this.$toast.show('请选择购买的商品',2000)
         }
       }
    }
  }
</script>

<style scoped>
  .bottom-menu {
      width: 100%;
      height: 44px;
      background-color: #eee;
      position: fixed;
      bottom: 50px;
      left: 0;
      box-shadow: 0 -2px 3px rgba(0, 0, 0, .2);
      font-size: 14px;
      color: #888;
      line-height: 44px;
      padding-left: 35px;
      box-sizing: border-box;
    }

    .bottom-menu .select-all {
      position: absolute;
      line-height: 0;
      left: 12px;
      top: 13px;
    }

    .bottom-menu .total-price {
      margin-left: 15px;
      font-size: 16px;
      color: #666;
    }

    .bottom-menu .buy-product {
      background-color: orangered;
      color: #fff;
      width: 100px;
      height: 44px;
      text-align: center;
      line-height: 44px;
      float: right;
    }
</style>